Moving-picture-machine shutter



M. L. PARRET. MOVING PICTURE MACHINE SHUTTER.

APPLICATION FILED SEPT- H, 1920.

Patented-Aug. 2,

4 [funnier y %%al @7722 UNITED STATES MILTON L. PARRET, OF MABSHALLTOWN, IOWA.

MOVING-PIOTURE-MAGHINE SHUTTER.

a citizen of the United States, and a res1- dent of Marshalltown, in the county of Marshall and State of Iowa, have invented a certain new and useful Moving-Picture-Machine Shutter, of which the following is a specification.

The object of my invention 1S to provide a shutter device sometimes called a light breaker for moving picture machines of very simple and inexpensive construction.

More particularly it is my object to provide such a device having a plurality of series of spaced members, adapted to be intermittentlv moved into the path of travel of the light through the machine 1n any manner, as the members of each series travel in diil'erent directions, but substantially simultaneously, through said path. I

With these and other objects in view, my invention consists in-the construction, arrangement and combination of the various parts of my device, whereby the ob'ects contemplated are attained, as hereina er more fully set forth, pointed out in my claim, and illustrated in the accompanying drawingz s, in which: I

igure 1 shows a vertical, sect1onal v1ew through a moving picture machine, equipped with a light breaker embody ng my invention.

Fig. 2 shows a detail, sectional view taken on the line 2-2 of Fig. 1.

Fig. 3 shows a detail, sectional view taken on the line 3-3 of Fig. 2. a

Figs. 4 and 5 show diagrammatic views illustrating the light breaker in different positions of its movement with relation to the path of light and Fig. 6 is a preferred form of my device showing the spaced members arranged in groups, the members .of which are placed obliquely with relation to the axis of the device.

In the accompanying drawings 1 have used the reference numeral 10 to indicate generally the frame of a moving picture machine, having the fire shutter 11 adjacent to the light aperture Hand having the lens 13. The main power shaft is indicated by the reference numeral 14. A gear 15 meshes with a gear 16 on the shaft 17.

On the shaft 17 which is the light breaker shaft is a supporting member, such as a disk Specification of Letters Patent.

Patented Aug. 2, 1921.

Application filed September 14, 1920. Serial No. 410,250.

18. Projecting laterally from the disk 18 are two series of wires 19. The wires of each series are arranged in the arc of a circle, having its center at the center of the shaft 17 It will be seen that the light breaker thus has substantiall the form of a cylinder, as here shown, alt ough it may be made in a great variety of forms.

it should be mentioned that the wires 19 are preferably of such thickness in the directlon of their path of travel through the light and are so located with reference to each other in the series that the distance between the wires is substantially less than such thickness of the wires.

it may be mentioned also that the distance between the series is less than the ion h of the series circumferentially of said cy inder.

in the practical use of my improved light breaker, the light breaker shaft 17 is rotated at such a speed that it travels one and one-half revolutions, during the time that one picture is being thrown on the screen and the next picture is being moved to position to be thrown on the machine.

In Fig. 5, I have shown the position of the light breaker just as the picture stops and is ready to be thrown on the screen.

The li ht breaker moves substantially oneand oneourth revolutions from its position shown in Fig. 5 and thereupon the intermittent movement device operates during the next quarter revolution of the light breaker.

During the time of the movement or the film, the series of wires or the like 19 are both interposed in the path of light.

Fig. 5 shows the position of such series just at the finish of the movement of the film, while Fig. 4 shows the position at about the time the film has half completed its movement.

it may be mentioned that my invention may be constructed in a variety of forms. By the use of the term wires in my claim, I intend any form of opaque members, whereby the result can be obtained.

It may be mentioned also that this series may be mounted on different supports, if deemed.

Among the important features, which. I desire to embody in my invention is the arrangement of the wires or the like in at least two different series, and the bringing of the series intermittently into the path of light much in such manner that the series move simultaneously, and yet move across the path of light in difierent directions.

lhe open spaces 20 between the two series 19 may be broken by a small number of wires or the like 21.

In Fi 6 I have shown the series of wires arran e obli uely to the axis of the cylinder. en the series of wires or spaced members, as shown in Fig. 6 are in the path of light the light will be spread out to a eater degree.

It wfil be understood that the light breaker may be mounted forwardly of the lens 13 as desired; In my experiments I have found that the light breaker will work as effectively ineither osition.

Some 0 anges may be made in the construction and arrangement of the parts of my device, and it is m intention to cover by my claim, any modlfied forms of structure or use of mechanical equivalents, \whereb my objects may be attained, and within t e scope of my claim.

I claim as my invention:

The combination with a moving picture projection machine a light breaker or shutter device comprising a cylindrical shaped member havin a pair of series of obliquely arranged mem rs adapted to be intermittently moved into the path of light for partlally shutting ofi the light during the movement of the film from one picture to the other for substantially eliminating the flicker.

Des Moines, Iowa, September 3, 1920.

MILTON L. PARRET. 

